Drill sharpener



J. DWSON DRILL SHARPENR Filed Sept. 5. 92l Sa'ShwcS-Sheet 2 HIS AT f! vJan, 6. 1925. @51,71

' '.J. DITSQN DRILL SHARPENER me@ sept. s, 1921 s--shmsshet :y

INVENTOR vsgeg'wm Patented dan.` 6, 1925.

UNITED STATES JESSE DITSON, 0F LITTLETON, COLORADO,

PATENT: OFFICE.

ASSIGNOR T0 ING-ERSOLL-RAND COMPANY,

0F JERSEY CITY, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

DRILL sHaRrENER. ,1

Application led September To all 'whom t may concern.'

Be it known that I, JESSE 4DrrsoN, a citizen of the United States, aresident of Littleton, county of Arapahoe, and State of Colorado, havevinvented 'a certain Drill Sharpener, of which the following is aspeciication, accompanied by drawings.,

This invention relates to drill Sharpeners 4of the self contained type,having a vertically movable fluid actuated cross head which carries theupper half of the dies and other accessories, the lower cooperating halfof said dies and accessories being'oarried upon the main cylinder frame.

The objects of the invention are toimprove upon and simplify theconstruction of such machines, permit the piston for the cross head tobe operated upwardly by constant pressure maintained in the base of themachine as a pressure reservoir, so that no air is consumed on theraising stroke, enable all the sharpening operations to be controlled.by a single throttle valveand inanually actuated lever, and produceample clamping pressure without excessive shock to the machine. f

Further objects of the invention will here inafter appear and to `all ofthese ends the invention consists ofthe features of construction;arrangement' of parts and combinations of elements, substantially ashereinafter fully described and claimedin this specification, and shownin the accompany ino drawings, in which igure 1 is a longitudinalsectional elevation'of a drill Sharpener.

Figure Qfis a detail longitudinal sectional elevation partly broken awayof that portion Aof the machine includin the throttle valve chestshowing the thrott e'valve in another position,

Figure 3 is a det-ail vertical sectional elevation through the throttlevalve chest at right angles to the view shown in Figure 1v with thevalve in still another position,

Figure 4 is a' side elevation partly 'in longitudinal section of themachine taken at right angles to Fig-ure 1. y

Figure 5 is a detail longitudinal sectional elevation through the hammercylinder 'showing the hammer in a diii'erent position fro that indicatedin Figure 4:.

l e 6 is a side elevation ,partly in longitudinal section on the line6-6 of Figureb?, the view being taken from the same s, 1921. serial No.498,212.

'side of the machine as that shown in Figure 4, and

Figure 7 is a partial top plan view of Fiv'ure 6.

tReferring to the drawings, the machine comprises the base A` having amain cylinder frame B suitably secured thereto as by means of the studsC' and nuts D. A cross head rod E is movable vertically in the maincylinder frame B and carries a cross head F at its upper end and apiston Gr at its lower end, operatin in the cylinder bore H. The pistonG has lie reduced extension J sleeved over the reduced end K of thecross head` rod E and `suitably securedto the rod E by means of the nutL and locking key O. The C raising stroke. No air is admitted within l Kthe large cylinder bore H beneath the piston head G for the raisingstroke, but said space is open to atmosphere andmeans are provided forcushioning the downwardl stroke of the piston when live air is admittedabove the main pistonhe'ad G for the downward stroke. The distributionof motive Huid from the hollow base or constant pressure reservoir forthe operation`of'the machine, iscontrolled by a throttle valve S movablein the valve chest T andL controlled -by the manually operated handle U.

The provision of a constant pressure reservoir of motive Huid within thehollow base -A enables me touse a comparatively long and small supplypipe connected to the inlet R of the reservoir. In operation, a cylinder,of comparatively large size maybe supplied in a rapid manner fromthereservoir in the base without a substantial drop in pressure.` Thereservoir is connected by a passage V in the main cylinder casing toal'port 4in the valve chest T which opens directly into the cylinderabove the piston G when the vconi ing stroke and no air is consumed o-nsa-id stroke, the construction of the throttle valve S and throttlevalve chest T is much simplied.

The throttle valve Sis provided with the heads-W and X connected by thestem Y, and a bell crank Z pivoted at one end to the throttle valve bymeans of the pin a and connected at the other end to the hand levershaft I), enables the throttle valve to be raised and lowered by rockingthe lever U. The lever U may be clamped to the shaft b as by means ofthesplit socket c and bolt d.

When the valve lever U is in central or neutral position, as indicatedin F igurel which is the position l"indicated in dotted lines in Figure3, the valve` head-VV closes communication between the supply passage Yfrom the reservoir in the base, and t e space above the piston head G isopen to atmosphere/through the passage e communieating with the valvechest and thence around the stem Y of the valve to the small port j' andthen through the passage g in the wall oi the valve chest toY the port hcommunicating with the exhaust pipe j. The space beneath. the pistonhead G is also open to atmosphere through the 'passage k communicatingwith the valve chest, and the passage g. The piston G is in itsuppermost position due to the constant pressure on the smaller pressurearea constituted by the lower end of the piston shank and cross head rodwithin the cdnstant pressure reservoir.

Movement of the operating handle U from the neutral position to theposition indicated in full lines at 2 in Figure 3, admits live air abovethe main piston head G to carry the piston and cross head downwardly,but in passing from position 1 to position 2 indicated in Figure 3, thehandle U passes through the intermediate position 1a indicated in detailin Figure 2. In Figure 2, thc valve has been moved upwardly a suieientdistance to open communication between the passage V and the the stem Yof the valve, so that motive Huid passes above the piston head G andforces the piston downwardly. The descent and blow of the piston G riscushioned, owing to the fact that the exhaust from beneath the pistonhead G passing out through the passage is and the small passage g in thewall of the valve chest T, is throttled at this point in the movement ofthe valve]A Continued movement of the handlever U to the second positionindicated in Figure 3, raises the valve suficientlyto permit the exhaustfrom beneath the piston head G to pass out directly underneath the valvehead X to atmosphere through the exhaust pipe j, instead of through thethrottling passage g.

Continued movement of the valve handle U to the third position asindicated in Fig` passage e, past ure 4, which is the piston shown indotted lines at 3 in Figure 3, moves the valve S upwardly still furtherand admits live air from the passage V" around the valve stem Y to a`supply passage o in the frame of the 7) machine leading to the hammercylinder p for actuating the dolly g, which is shown in Figures 4 and 5operating upon the drill steel 1 held within the dies s, carried by thecross head F and the main cylinder frame B respectively. y

The hammer cylinder p may /be mounted on the main cylinder frame B, asby means of the clamping plates t and bolts u. The

hammer cylinder p is provided lwith a back head 'v and a front head w,which front head forms .a guide for the dolly g, and a ring or bushing mis inserted within the cylinder rearwardly of the front head fw. The

parte of the hammer cylinder are held together by the usual side bolts yhaving springs .e and nuts 6. The hammer piston 7 is preferably of thevalvele'ss type, andthe arrows in Figures 4 and 5 sufficiently indicatethe distribution of motive fluid for 99 actuating a hammer and operatingthe dolly when the valve lever U is in the position indicated. in Figure4. The usual dolly spring 8 is provided for the dolly.

By reversing the rocking movement of the valve lever U and returningsaid lever' from position 3 through position 2 and la to the neutralposition l, all as indicated in Figure 3, the cylinder bore H above thepiston head Gl will be exhausted to atmosm0 phere and the constantpressure on the reduced shank of the piston will raise the cross head Fto the position indicated in Figure l.

By rocking the valve handle U backm5 wardly to the position indicated infull lines in Figure 6, and in dotted lines indicated at 4 in Figure 3,an arm 9 on the valve lever U will bear upon and force downwardly thevalve stem 10 of a spring pressed blow 110 valve l1 which is normallyheld to its seat 12 by the` spring 13 and live air will be admittedfromvthe valve chest T t0 a pas- .sage 14,1eading to a blow head 15having downwardly directed apertures 16 which 115 direct the air blastupon lthe dies s to clean them for the next operation.

l claim: j

1. In a drill Sharpener, the combination of a hollow base maintainedunder substantently supplying motive Huid from the base m30 tothecylinder bore above the piston head for actuating the cross head and roddownwardly, the under side of said piston head being open 'only toatmosphere, and means for thro'ttling` the escape of air from beneaththe piston head on the downward 'stroke to cushion the piston head.

2.l In a drill Sharpener, the combination of a hollow base constituting.a pressure reservoir, means for maintaining. motive fluid under constantpressure 1n said reservoir, a main cylinder frame mounted onV said base,a cross head` rod movable vertically in said cylinder frame Aandextending into the base, the lowerfend of the cross head rod beingthereby subjected to constant Huid pressure tending to raise it, a crosshead on said rod, a piston head in vsaid rod. reciprocating in the boreof the cylinder frame, and means for supplying motive fluid from thebase reservoir to actuate the pistonhead downwardly, while atA the sametime maintaining the under side of the piston head open only; toatmosphere.

3. In a drill Sharpener, the combination lof a hollow base, constitutinga pressure reservoir, means for maintainingmotive fluid under constantpressure in said reser-l voir, a main cylinder frame mounted o n saidbase, a cross head rod movable vertically in said` cylinder frame andextending into the base, the lower end of the cross.

head rod being thereby subjected to constant fluid pressure tending toraise it, across head on said rod, a piston head in said rodreciprocating in the bore of the cylinder frame, means for supplyingmotive fluid from the base reservoir to actuate the piston headdownwardly while at thev same time maintaining the under side of thepiston head open only to atmosphere, including means for throttling theescape of air from beneath the piston head on the downward stroke forcushioning the piston head` 4. In a drill Sharpener, the combinationv4of a base, a main cylinder ,frame mounted on said base, a lu'idvactuated cross head rod movable vertically in said cylinder. frame, across head carried by said rod, co-

operating dies carried by the; cross head vand cylinder frame, a blowhead located on the cylinder frame adjacent said dies, and

a throttle valve Jfor controlling the distribu tion of fluid pressure inthe machine incluling the supply of Huid to the said blow hea of a base,'a'main' cylinder frame mounted 5. In a'drill Sharpener, thecombination,

on said base, a fluid actuated cross head rod movable vertically in saidcylinder vran'ie, a cross head -carr1ed by /said vrod, cooperating diescarried by the cross'head and cylin e r frame, a blow head' located onthev cylinder frame adjacent said dies, a throttle valve fop`controlling the distribution head valve 'adjacent said throttle valve,and means for opening the blow head valve to lsupply fluid pressure'tothe blow head when said throttle valvelis moved to agiven position. l J6. In a drillsharp'ener, the'combination of a base, a-main cyl-inderframe mounted on said base, Aa fluid actuated cross head rod movablevertically in said cylinder frame, a cross head carried by said rod, a'fluid actuated hammer mounted /on the cylinder frame, a fluid supplypassage in the cylinder frame leadingl tothe said hammer, a valve cheston the cylinder frame and a throttle valve in'said chest for controllingthe'distribution of motive Huid for actuating the cross head and forcontrolling said Isupply passageleading to the hammer. v

7. In a drill Sharpener, the combination with Va hollowbaseforming amotive iuid reservoir, a main cylinder frame mounted on said base havinga smaller cylinder openi ingl into said reservoir, a cross head rodmovable vertically in said cylinder frame and constantly subjected tothe pressure in the base tending to move the rod in one direction, across head and a piston head carried by said rod and means for supplyingmotive fluid to the piston for movinghead Ycarried by-said rod, a pistonhead onn said rod operating in the larger bore of said main cylinderframe and means 4for intermittently supplying motive fluidv to thelarger ,cylinder bore above the piston headv lCf) for actuating thecrosshead rod rand` crossv I head downwardly.

. 9. In adrill sharpener,'the combination'.

of' a hollow base forminga motive fluid reservoir, a main 'cylinderAframe mounted on said base having a large c linder bore and a smallcylinderbore eX ending'into said reservoir, a cross head 'rod movablevertically inthe Asn'ia'ller bore of said cylinder frame and constantly,subjected tothe pressurein the,v reservoir tending to move thel rod 1none direction, .a cross head, a piston head carried by the -rod and`operating in the larger bore Vofthe cylinder frame, means. forsupplying motive fluid to: the pistonl for lmoving the-cross head vrodand cross head in the opposite direction and means for 'l cushioningthe'piston head Vwithin the 'larger bore ofthe cylinder frame asthepiston head reaches the end of its stroke in said opposite direction.

10. In a drill Sharpener, the combination of a hollow base forming amotive fluid reservoir, -a main .cylinder frame mounted on said basehaving a large cylinder bore and a small cylinder bore extending intosaid reservoir, a cross head rod movable vertically in said smaller boreand constantly subjected to the pressure in the reservoir tending tomove the rod upwardly, a cross head carried by the rod, a piston head onsaid rod operating in the larger bore of the cylinder frame, meansforintermittently supplying motive fluid to the large cylinderabove thepiston head for actuating the cross headkrod and cross head downwardlyand means for cushioning the piston head within the cylinder frame asthe piston reaches the end of its downward stroke. f

11. In a drill Sharpener, the combination of a hollow. baseforming amotive fluid reservoir, a main cylinder frame mounted on said base andhaving a large cylinder bore and a small cylinder-bore extending intosaid reservoir, a cross head rod movable vertically 1n said smaller boreand constantly subjected to the pressure in the reservoir tending tomove the rod upwardly, a cross head carried by the rod, a piston head onthe rod operating in the larger bore of the main cylinder frame, meansfor intermittently supplying motive fluid to the larger bore above thepistonfhead for actuating' the cross head rod and cross head pistondownwardly and means for throttling the escape of air from beneath thepiston head for cushioning the stroke as the piston reaches the end ofits downward stroke.

12. In a drill Sharpener, the combination of a hollow base forming amotive fluid reservoir,` a frameon said base having a large cylmder boreand a small bore extending into said reservoir, a cross head and avertically movable cross head rod operating in the smaller bore andconstantly subjected to the pressure in the reservoir for moving thecross head and rod upwardly.

13. In a drill Sharpener, the combination of a .hollow base forming amotive fluid reservoir, a mainv cylinderframe on said base having alarge bore and a small bore extending into said reservoir, a cross head;a vertically movable cross head rod operating in the smaller bore andconstantly sub- L jected to lthe -pressure in the reservoir for movingthe cross head and rod upwardly and means for controlling the supply ofmotive Huid from said reservoir for actuating the cross head and roddownwardly.

In a drill Sharpener, the combination of hollow base forming ervoir''under substantially constant pres- Areservoirto t a motive Huidressure, a main-.cylinder frame having a large, bore and a relativelysmaller bore extending into said reservoir, a cross head, a verticallymovable cross head rod operating in the smaller boreand constantlysubjected to the pressure in the base for moving the cross head and rodupwardly, means for supplying motive fluid yfrom the reservoir foractuating the cross head and rod downwardly and means for cushioning thedownward stroke of the cross head.

l5. In a drill Sharpener, the combination of a hollow base forming amotive fluid reservoir under substantially constant pressure, a maincylinder frame on said base having a main bore and a relatively smallerbore extending into said reservoir, a cross head, a vertically movablecross head rod operating in said smaller bore and constantly subjectedto the vpressure in the reservoir for moving the cross head and rodupwardly, a piston head on said cross head rod operating in thelarger'bore and means for sup-y plying motive uid from the reservoir foractuatingthe piston head and rod downwardly.

16. In a drill Sharpener the combination of a hollow base forming amotive fluid reservoir under substantially constant luid pressure, amain cylinder frame on said base having a large bore and a relativelysmaller bore extending into the reservoir, a vertically movable crosshead rod constantly subjected to the pressure in the reservoir formoving the cross head and rod upwardly, a piston head on said cross headrod operating in the larger bore, means for supplying motive fluid fromthe reservoir 'for actuating the piston head and rod downwardly andmeans for throttling the escape of air from beneath the piston head onthe downward strokfe to cushion the piston head.

17. In a drill Sharpener, the combination of a: hollow `base forming amotive fluid reservoir under substantially constant fluid pressure, amain cylinder frame mounted on said base having a large bore and arelatively smaller bore extending into the reservoir, a cross head rodmovable vertically in the smaller bore and .constantly subjected to thepressure in the reservoir tending to move the rodin `one direction, across head on said rod and a piston headl carried by the rod foroperating in the largerbore, a valve chestmounted on the cylinder framemittently supplying-motive fluid from the j e larger bore abovethepiston head for actuating the cross head and rod downwardly.

onywh'ereof I have signed this i2() and a throttle valve in said chest'for interr

